So back in the late eighties DC decided to reboot Superman by making him less powerful and making changes to his back story. Specifically, that he never had been Superboy, didn't meet Lex Luthor until both were adults, etc.
The character of the Silver Age Superboy was revealed to have been a creation of the Legion foe, the Time Trapper, and was killed off in a Legion of Superheroes story. Now, wait a minute. The Silver Age Superman was supposed to have been the mature version of that Superboy character and, in his mag, made frequent references to events that had occurred in either the Superboy or Adventure Comics.
But if Superboy had been killed, who was the Superman who remembered having been Superboy? Did they ever address this in-universe?